C Programming Practice Set-1

01. What is the final value of the digit?

main()
{
    int digit;
    for(digit=0;digit<=9;++digit)
    printf("%d\n",digit);
    digit = 2*digit;
    --digit;
}
            

1) 19 2) -1 3) 17 4) 16

02. What is the output of the following program?

#include <stdio.h>
#define square(x) x*x
main()
{
    int b,c=3;
    b=square(c)++;
    printf("%d",b);
}
            

1) 3 2) 4 3) 9 4) 16

03. If x and y are variables declared as double x=0.005, y=-0.01; What is the value of ceil(x+y) where ceil is a function to compute the ceiling of the number.

1) 1 2) 0 3) 0.005 4) 0.5

04. What will be the output of the following program?

main()
{
    int i = 255, j=0177, k=0xa0;
    printf("%x %o %d",i,j,k);
}
            

1) 255 0177 a0 2) ff 177 160 3) 255 0177 0xa0 4) error

05. In the case of ordinary int variables

1) the left most bit is reserved for sign 2) the right most bit is reserved for sign 3) no bit is reserved for sign 4) none

06. #define microprocessor command is used for defining

1) macros 2) for loop 3) symbolic constants 4) both 1 and 3

07. If i=20 and j=i<=i then

1) i=j 2) j=2i 3) j=2j 4) j=i-1

08. The minimum number of temporary variables needed to swap the contents of two variables is

1) 2 2) 1 3) 3 4) 0

09. Coercion

1) takes place across assignment operator 2) takes place if an operator has operands of different data types 3) means casting 4) both 1 and 2

10. What is the output of the following

main()
{
    int x,y=2,z,a;
    x=(y*=2)+ (z=a-y);
    printf("%d",x);
}
            

1) 7 2) 6 3) 8 4) error

11. Bit fields will be accommodated in a word

1) from left to right 2) from right to left 3) in a way that depends on the implementation 4) none of the above

12. The && and || operators are used to

1) combine two numeric values 2) combine two Boolean values 3) combine two float values 4) combine two double values

13. A C function can have variable parameters

1) true 2) false 3) can't say 4) none

14. Can a void pointer be used in manipulations

1) yes 2) no 3) can't say 4) none

15. Output of the following

struct abc { };
main()
{
    printf("%d",sizeof(struct abc));
}
            

1) 1 2) 0 3) error 4) none

16. switch(a)

{
    default: printf("A");
    case 1: printf("B");
}
            

If a=2 then the output is

1) AB 2) A 3) B 4) error

17. Which keyword in C is used to avoid register storage

1) static 2) extern 3) volatile 4) none

18. What is the value of k in the following code?

struct ab { char a; char b; };
union abcd {
    int c;
    struct ab d;
} jk;
jk.d.a = 5;
jk.d.b = 0;
// when the value of k.c is
            

1) 5 2) 7 3) 0 4) 50

19. fp = fopen("abc.dat","r+"); then the contents of "abc.dat"

1) exists 2) can be modified 3) can be appended 4) all

20. What is the output of the following program

int i=7;
extern int a;
f(i);
printf("%d %d",a,i);
}
int a;
f(int g)
{
    g=g+1;
    a=g;
}
            

1) 7 2) 8 3) error 4) none

21. In recursion which variables are not stored on the system stack

1) static 2) local 3) global 4) both a and c

22. What is the output of the following program

int a[]={4,2,3};
int *p=a;
p++;
printf("%d",*p);
            

1) 4 2) 2 3) error 4) none

23. Can a function be passed as a parameter to another function

1) true 2) false 3) can't say 4) none

24. What is the value of c is

enum abc {a=1,b=5,c=8};

1) 6 2) 2 3) 7 4) garbage

25. char * const p = "Good" then

1) contents of p can be changed 2) "Good" can be changed 3) Both 1 and 2 4) none

26. Which of the following is the primitive data type

1) string 2) array 3) file 4) none

27. What is the output of the following program

int sum=0;
for(i=-10;i++)
    if(i%2==0)
        sum=i+sum;
printf("%d",sum);
            

1) 45 2) 40 3) 0 4) 30

28. If a=-11 and b=-3. What is the value of a%b

1) 2 2) 3 3) -2 4) -2

29. What is the output of the following program

main()
{
    int sum=0,i;
    for(i=100;i>=0;i--)
        sum=abs(i)-sum;
    printf("%d",sum);
}
            

1) 100 2) 5050 3) -5050 4) -100

30. Pick the correct statement

1) unions are like structures 2) unions contains members of different data types which share same storage area in memory 3) unions are less frequently used in program 4) all the above

31. Consider the following declaration enum colors {black,blue,green}; this represents

1) black=0,blue=1,green=2 2) color ='black' or color ='blue' or color ='green' 3) color[0]='black' 4) none

32. The library function exit() is used for exit from

1) a loop 2) a block 3) a program 4) all

33. When an array name is passed to a function, the function

1) accesses exactly the same array with the same name as the calling program 2) accesses a copy of the array passed by the program 3) both 1 and 2 4) none

34. What is the output of the following program

#define row 3
#define col 4
int a[row][col]={
    1,2,3,4,5,6,7,8,9,10,11,12};
main()
{
    // code is incomplete, output depends on print statement
}
            

1) 12 2) 10 3) 12,245 is a legal string constant in C 4) none

35. What is the output of the following program

main()
{
    int a=25,*ptr,b,c;
    ptr=&a;
    b=a*30;
    c=*ptr;
    printf("%d %d %d",a,b,c);
}
            

1) 25,25,25 2) 25,750,25 3) 25,55,55 4) none

36. What is the output of the following program

main()
{
    char ch='A';
    while(ch<'F')
    {
        switch(ch)
        {
            case 'A':
            case 'B':
            case 'C':
            case 'D':
            case 'E':
                ch++;
            case 'F':
                ch++;
        }
        putchar(ch);
    }
}
            

1) ABCDEF 2) FG 3) EFG 4) CEG

37. Pick the correct one

1) while(0) { i=2; } 2 is assigned to i 2) do { i=2; } while(0); 2 is assigned to i 3) both 1 and 2 4) none

38. Pick the correct one

1) calloc() allocates and clears memory 2) malloc() allocates memory but does not clear memory 3) both 1 and 2 4) none

39. Pick the correct one

1) a char type has an equivalent integer interpretation so it is really special kind of short integer 2) the printf() is a macro which takes in a variable number of arguments 3) 12,245 is a legal string constant in C 4) none

40. Pick the correct one

1) the statement x=x+2 is equivalent to the statement x+=4 2) an if else statement can be replaced by a ternary operator 3) both 1 and 2 4) none

41. What is the output of the following program

extern int a;
main()
{
    printf("%d",a);
}
int a=50;
            

1) 50 2) 0 3) garbage value 4) error

42. Suppose a program is divided into 3 files f1, f2, f3 and a variable defined in f1 is to be used in files f2 and f3 then the storage class of the variable is

1) auto 2) static 3) register 4) extern

43. Examine the following program

main()
{
    display();
    display();
    printf("Titanic is a ship");
}
// Pick the correct answer
            

1) display() function returns void type data by default 2) display() function returns int type data by default 3) display() function displays a message "Titanic is a ship" and returns number of bytes displayed 4) both 2 and 3

44. What is the output of the program

main()
{
    int i;
    int a[5]={10,20};
    for(i=0;i<5;i++)
        printf("%d",a[i]);
}
            

1) 10 20 2) 10 20 0 0 0 3) 10 20 and remaining 3 values are garbage 4) error in initialization

45. What would be the output of the program

main()
{
    int i=4;
    switch(i)
    {
        default: printf("A is a upper case letter");
        case 1: printf("B is a lower case letter");
        case 2: printf("0-9 digits"); break;
        case 3: printf("Ascii value of a is 97");
    }
}
            

1) default keyword should not be on top of all cases 2) A is upper case letter B is a lower case letter 3) Wont print any message as no case is 4 4) None

46. Point out the error, if any in the following program

main()
{
    int i;
    for( ; ; )
    {
        printf("%d",i++);
        if(i>10)
            break;
    }
}
            

1) the condition in the for loop is a must 2) the two semicolons should be dropped 3) the for loop should be replaced by a while loop 4) no error in the program

47. Point out the error, if any, in the following program?

main()
{
    int i=4, j=1, k=2;
    switch(i)
    {
        case i:
        case j:
        case k: printf("All are same"); break;
    }
}
            

1) error as no statements for first two cases 2) constant expressions required in the second and third case, we can't use i and k 3) no error in the program 4) none of the above

48. Point out the error if any, in the following program

main()
{
    int i=1;
    switch(i)
    {
        case 1: 
            printf("n Hello");
        case 1: 
            printf("n case one"); break;
        case 2: 
            printf("n case two"); break;
        case 1+3*4: 
            printf("n case last"); break;
    }
}
            

1) the first printf() can never get executed and all statements in a switch have to belong to same case or the other 2) case label should not be an expression 3) the first printf should not exist, so error in program 4) none of the above

49. What would be the output of the following program

main()
{
    int i=-3, j=2, k=0, m;
    m=++i && ++j || ++k;
    printf("%d %d %d",i,j,k,m);
}
            

1) -4 2 0 1 2) -4 3 0 1 3) -2 3 0 1 4) -2 3 1 1

50. What would be the output of the following program

main()
{
    printf("%d %d",sizeof(3.0),sizeof(3f));
}
            

1) 4 4 2) garbage value 3) 8 4 4) 8

51. By default any real number is treated as

1) float 2) double 3) long double 4) depends upon memory model used

52. What would be the output of the program

main()
{
    int arr[] = {12,13,14,15,16};
    printf("%d %d %d",sizeof(arr),sizeof(*arr),sizeof(arr[0]));
}
            

1) 2 2 2 2) 10 2 2 3) 5 2 2 4) none

53. What would be the output of the following program

#include <stdio.h>
main()
{
    int a,b=5;
    a=b=!NULL;
    printf("%d",a);
}
            

1) 1 2) 6 3) 7 4) 0

54. What would be the output of the following program

main()
{
    int near *a;
    int far *b;
    int huge *c;
    printf("%d %d %d",sizeof(a),sizeof(b),sizeof(c));
}
            

1) 2 2 2 2) 2 2 4 3) 2 4 4 4) 4 4 4

55. According to ANSI specifications which is the correct way of declaring main() when it receives command line arguments

1) main(int argc, char *argv[]) 2) main(char *argc, int argv[]) 3) main(int argc, char *argv[ ]) 4) none

56. What would be the output of the following program assuming that the array begins at location 1002.

main()
{
    int a[3][4] = { 1,2,3,4,5,6,7,8,9,10,11,12};
    printf("%u %u",a[0]+1, *(a[0]+1));
}
            

1) 1004 2 2) 1004 2 3) 1004 2 0 4) none

57. What would be the output of the following program

#include <stdio.h>
main()
{
    printf("%d",sizeof(NULL));
}
            

1) garbage 2) 0 3) 1 4) 2

58. Examine the following program and comment on it

main()
{
    float *p1,l=25.5;
    char *p2;
    p1 = &l;
    p2 = &l;
}
            

1) executes successfully 2) simply a warning 3) an error of suspicious pointer conversion 4) none

59. What is the output of the following program

main()
{
    char a[]="neelesh";
    char *b="neelesh";
    printf("%d %d",sizeof(a),sizeof(b));
    printf("%d %d",sizeof(*a),sizeof(*b));
}
            

1) 1 1 2 1 1 2) 10 10 1 1 3) 1 2 10 10 4) none

60. Examine the following program

main()
{
    const int x;
    x=128;
    printf("%d",x);
}
            

1) 128 2) error at compile time 3) error at runtime 4) none

61. Pick up the correct one from following

1) bool is a keyword in C 2) asm is a keyword in C 3) void is a keyword in C 4) none of the above

62. What would be the output of the following program

main()
{
    int i=10,j=12,k,l,m;
    k = i&j;
    l = i || j;
    m = i^j;
    printf("%d %d %d",k,l,m);
}
            

1) 1 4 8 6 2) 6 8 14 3) 8 14 6 4) none

63. Which of the following bitwise operator is used for masking a particular bit in a number

1) & 2) | 3) ^ 4) ~

64. What is the maximum memory that we can allocate by a single call of malloc()

1) 64KB 2) 640KB 3) 256 bytes 4) infinite size

65. What would be the output of the second printf() in the following program

#include <alloc.h>
main()
{
    int *p;
    p=(int*)malloc(20);
    printf("%u",p); // suppose this prints 1314
    free(p);
    printf("%u",p);
}
            

1) 1314 2) 1316 3) garbage 4) error

66. What would be the output of the following program

main()
{
    float a[]={ 1.2,4.2,3,4,5,6,7};
    printf("%d",sizeof(a)/sizeof(a[0]));
}
            

1) 1 2) 0 3) 7 4) 2

67. What would be the output of the following program

main()
{
    char str[] = "hello";
    printf("%s",str);
}
            

1) error 2) hello 3) can't say exactly 4) none

68. Which of the following is true about "argv"

1) it is an array of character pointers 2) it is a pointer to an array of character pointers 3) you cannot use variable name other than argv 4) none

69. A C program contains the following array declaration char text[80]; and initialized with a string "Getting a seat can be a challenging". The output resulting from the printf("%-18.7s",text);

1) Getting a seat cab be a challenging 2) Getting a seat can 3) Getting 4) Getting a seat can be a C

70. In the following program, how many functions are used

#include <stdio.h>
main()
{
    printf("hello friend");
}
            

1) 0 2) 1 3) 2 4) all

71. What is the output of the following program

main()
{
    char far *s1, *s2;
    printf("%d %d",sizeof(s1),sizeof(s2));
}
            

1) 2 2 2) 4 2 3) 4 4 4) 2 4

72. What would be the output of the following program

int x=40;
main()
{
    int x=20;
    printf("%d",x);
}
            

1) 40 2) 20 3) 60 4) none

73. What is the output of the following program

main()
{
    int x=40;
    {
        int x=20;
        printf("%d",x);
    }
    printf("%d",x);
}
            

1) 40 40 2) 20 40 3) 40 20 4) 20 20

74. What would be the output of the following program

main()
{
    extern int i;
    i=20;
    printf("%d",sizeof(i));
}
            

1) 3 2) 4 3) 2 4) varies from compiler to compiler

75. Which of the following is correct

1) a global variable has several declarations but only one definition 2) if we use extern it is a declaration and not definition 3) a function may have several declarations but only one definition 4) all

76. What is the output of the following program

main()
{
    display();
}
void display()
{
    printf("ECET");
}
            

1) Donot waste time 2) ECET 3) either 4) error

77. What is the output of the following program

main()
{
    extern int fun(float);
    int a;
    a=fun(3.14);
    printf("%d",a);
}
int fun(aa)
float a;
{
    return(int)aa;
}
            

1) 3 2) 3.14 3) 0 4) error

78. What would be the output of the following program

main()
{
    struct emp e={"puli"};
    printf("%d %f",e.age,e.sal);
}
            

1) 0 0.000000 2) garbage values 3) error 4) 0.0

79. What is the output of the following program

main()
{
    int (*p) = F;
    (*p)();
}
F()
{
    printf("Donot waste time");
}
            

1) Donot waste time 2) Donot study Enjoy 3) error 4) none

80. What is the output of the following program

main()
{
    int i=8;
    while()
    {
        printf("%d",i++);
        if(i > 10)
            break;
    }
}
            

1) the condition in while loop is a must 2) 8 9 10 11 3) infinite loop 4) none

81. What is the output of the following program

main()
{
    int i=1;
    while(i<=3)
    {
        printf("%d",i);
        goto america;
    india:
        printf("I");
        func()
        {
        america:
            printf("h");
        }
    }
}
            

1) 1h2h3h 2) infinite loop 3) error 4) the control goes to india not america

82. What is the output of the following program

main()
{
    int a=10;
    switch(a)
    {
    }
    printf("Always be an Indian");
}
            

1) Always be an Indian 2) 10 3) error 4) none

83. What is the output of the following program

main()
{
    int a=2,b;
    a >= b ? b=200;
    printf("%d",b);
}
            

1) 100 2) 200 3) error 4) garbage value

84. What is the output of the following program

main()
{
    char str[]="Come on dance. This is the day to celebrate";
    int a=5;
    printf("%40s",str);
}
            

1) Come on dance. This is the day to celebrate 2) Come 3) Come on celebrate. 4) Error

85. What is the output of the following program

main()
{
    static int a[20];
    int i=0;
    a[1] = 1++;
    printf("%d %d",a[0],a[1]);
}
            

1) 0 1 2) 0 0 3) 0 1 1 4) none

86. What is the output of the following program

main()
{
    int j=3;
    j = ++j + ++j;
    printf("%d",j);
}
            

1) 8 2) 9 3) 10 4) none

87. What is the output of the following program

main()
{
    int j=2;
    printf("%d %d",++j,j++);
}
            

1) 3 4 2) 4 3 3) 2 2 4) 4 4

88. What is the output of the following program

main()
{
    int x=10,y=20,z=5,i;
    i = x<y>z;
    printf("%d",i);
}
            

1) 0 2) 1 3) error 4) none

89. In the following code in which order the functions would be called a=f1(23)+f2(36)+f3( );

1) f1,f2,f3 2) f3,f2,f1 3) varies from compiler to compiler 4) none

90. What would be the output of the following program

main()
{
    int i=-3,j=2,k=0,m;
    m=++i || ++j && ++k;
    printf("%d %d %d",i,j,k,m);
}
            

1) -3 2 0 1 2) -2 2 0 1 3) -2 3 1 1 4) none

91. What would be the output of the following program

main()
{
    int i=-3,j=2,k=0,m;
    m=++i && ++j && ++k;
    printf("%d %d %d",i,j,k,m);
}
            

1) -3 2 0 1 2) -2 3 1 1 3) -2 2 0 1 4) none

92. What is the output of the following program

main()
{
    float b=0.8;
    if(b < 0.8)
        printf("Good Morning");
    else
        printf("Good Night");
}
            

1) Good Morning 2) Good Night 3) Good Afternoon 4) none

93. What is the output of the following program

main()
{
    float b=0.8;
    if(b <= 0.8)
        printf("Good Morning");
    else
        printf("Good Night");
}
            